From: Tim Vaughan <plugd@thelambdalab.xyz>
Date: Sat, 23 May 2020 20:37:16 +0000 (+0200)
Subject: Server serving over TLS.
X-Git-Url: https://thelambdalab.xyz/gitweb/index.cgi?p=rags.git;a=commitdiff_plain;h=a636a257f0e7509a4da85e6e8a6113cf7e46b83a

Server serving over TLS.
---

diff --git a/gratchy.scm b/gratchy.scm
index 3ddb540..9424a38 100644
--- a/gratchy.scm
+++ b/gratchy.scm
@@ -1,52 +1,130 @@
 (import (chicken io)
+        (chicken port)
         (chicken file)
+        (chicken string)
         (chicken pathname)
         (chicken condition)
-        uri-common)
+        (chicken process-context)
+        matchable srfi-13
+        uri-common openssl)
 
 (define SERVER-ROOT "public_gemini")
-(define SERVER-HOST "thelambdalab.xyz")
+(define SERVER-HOST "localhost")
+(define SERVER-HOST 1965)
+
+(define-record config
+  root-dir host port certfile keyfile) 
 
 (define file-types
-  '(("gmi" "text/gemini; charset=utf8")
-    ("txt" "text/plain; charset=utf8")))
-
-(define (process-request request-line)
-  (condition-case
-      (let ((uri (uri-normalize-path-segments (absolute-uri request-line))))
-        (cond
-         ((not (eq? (uri-scheme uri) 'gemini))
-          (fail-permanent "Unsupported scheme."))
-         ((not (uri-host uri))
-          (fail-permanent "URL lacks host name."))
-         ((not (equal? (uri-host uri) SERVER-HOST))
-          (fail-permanent "Proxy requests forbidden."))
-         ((uri-path-relative? uri)
-          (fail-permanent "Path must be absolute."))
-         ((not (document-available? uri))
-          (fail-permanent "Document not found."))
-         (else (serve-document uri))))
-    (o (exn)
-       (print o)
-       (fail-permanent "Failed to parse URL."))))
+  '(("gmi" "text/gemini" "charset=utf-8")
+    ("txt" "text/plain" "charset=utf-8")))
+
+(define (process-request config request-line)
+  ;; (condition-case
+  (let ((uri (uri-normalize-path-segments (absolute-uri request-line))))
+    (cond
+     ((not (eq? (uri-scheme uri) 'gemini))
+      (fail-permanent "Unsupported scheme."))
+     ((not (uri-host uri))
+      (fail-permanent "URL lacks host name."))
+     ((not (equal? (uri-host uri) (config-host config)))
+      (fail-permanent "Proxy requests forbidden."))
+     ((uri-path-relative? uri)
+      (fail-permanent "Path must be absolute."))
+     ((not (document-available? config uri))
+      (fail-permanent "Document not found."))
+     (else 
+      (serve-document config uri)))))
+  ;; (o (exn)
+  ;;    (print ((condition-property-accessor 'exn 'message) o))
+  ;;    (fail-permanent "Failed to parse URL."))))
 
 (define (fail-permanent reason)
   (print "50 " reason "\r"))
 
-(define (document-available? uri)
-  (print (document-path uri))
-  (file-exists? (document-path uri)))
+(define (document-available? config uri)
+  (file-exists? (document-path config uri)))
 
-(define (document-path uri)
-  (let* ((crumbs (reverse (cons SERVER-ROOT (cdr (uri-path uri)))))
+(define (document-path config uri)
+  (let* ((crumbs (reverse (cons (config-root-dir config) (cdr (uri-path uri)))))
          (path (make-pathname (reverse (cdr crumbs)) (car crumbs))))
     (if (directory-exists? path)
         (make-pathname path "index.gmi")
         path)))
     
-(define (serve-document uri)
-  (let ((path (document-path uri)))
-    (print "20 Surprise!\r")))
+(define (serve-document config uri)
+  (let* ((path (document-path config uri))
+         (ext (pathname-extension path))
+         (mime-detected (assoc ext file-types))
+         (mime (if mime-detected mime-detected (assoc "txt" file-types)))
+         (mime-type (cadr mime)))
+    (print "20 " (string-intersperse (cdr mime) ";") "\r")
+    (cond 
+      ((equal? mime-type "text/gemini") (serve-text-plain path))
+      ((equal? mime-type "text/plain") (serve-text-plain path))
+      (else (serve-binary)))))
+
+(define (serve-text-plain path)
+  (with-input-from-file path
+    (lambda ()
+      (let loop ((str (read-string)))
+        (unless (eof-object? str)
+          (print* str)
+          (loop (read-string)))))))
+
+
+(define (run-server config)
+  (define listener (ssl-listen (config-port config)))
+
+  (ssl-load-certificate-chain! listener (config-certfile config))
+  (ssl-load-private-key! listener (config-keyfile config))
+
+  (print "Host: '" (config-host config) "'\n"
+         "Port: '" (config-port config) "'\n"
+         "Root directory: '" (config-root-dir config) "'\n"
+         "Cert file: '" (config-certfile config) "'\n"
+         "Key file: '" (config-keyfile config) "'\n"
+         "\n"
+         "Gemini server listening ...")
+
+  (let-values (((in-port out-port) (ssl-accept listener)))
+    (let ((request-line (read-line in-port)))
+      (with-output-to-port out-port
+        (lambda ()
+          (process-request config request-line))))))
+
+(define (print-usage progname)
+  (print "Usage: " progname " [-h] [-p port] server-root-dir hostname certfile keyfile"))
+
+(define (main)
+  (let* ((progname (pathname-file (car (argv))))
+         (config (make-config #f #f 1965 #f #f)))
+    (if (null? (cdr (argv)))
+        (print-usage progname)
+        (let loop ((args (cdr (argv))))
+          (let ((this-arg (car args))
+                (rest-args (cdr args)))
+            (if (string-prefix? "-" this-arg)
+                (cond
+                 ((or (equal? this-arg "-h")
+                      (equal? this-arg "--help"))
+                  (print-usage progname))
+                 ((or (equal? this-arg "-p")
+                      (equal? this-arg "--port"))
+                  (config-port-set! config (string->bumber (car rest-args)))
+                  (loop (cdr rest-args)))
+                 (else
+                  (print-usage progname)))
+                (match args
+                  ((root-dir host certfile keyfile)
+                   (config-root-dir-set! config root-dir)
+                   (config-host-set! config host)
+                   (config-certfile-set! config certfile)
+                   (config-keyfile-set! config keyfile)
+                   (run-server config))
+                  (else
+                   (print "One or more invalid arguments.")
+                   (print-usage progname)))))))))
 
 
-(process-request "gemini://thelambdalab.xyz//")
+(main)